Signals with no Driver

This compiler hint appears when a pin (with I/O Type Input or IO) or a sheet entry (with I/O Type Input orBidirectional) is not connected to a driving pin or a port on the schematic sheet. The message is displayed in the Messages panel in the following format:

Signal SignalName has no driver,

where

SignalName is the name of the affected signal.

Default Report Mode

Error

Recommendation

This error can sometimes be caused by the offending pin/sheet entry not being wired to the intended net in the circuit. If this is the case, an additional error stating that the affected signal pin/sheet entry is unconnected will also appear in the Messages panel. Use the Compile Errors dialog to cross probe to the affected signal pin/sheet entry. Trace the wiring from the pin/sheet entry to ensure it is connected as required, and connect if it is not.

If the 'signal has no driver' message appears on its own, look for the component output pin to which the input pin/sheet entry is directly connected. Once identified, you can check/edit the output pin's electrical type from theComponent Pin Editor dialog. Access this dialog from the associated Component Properties dialog for the part by clicking the Edit Pins button.

Notes

This violation type will only be displayed when compiling an FPGA project (*.PrjFpg), a single source schematic that is part of an FPGA project, or a free schematic document.